[_CD6_]<autolayout>Phoenix25>Misc.mesa!1

-- File: Misc.mesa

-- Last Edited by: CSChow, February 1, 1985 0:42:39 am PST

Preas, August 1, 1986 6:53:45 pm PDT

DIRECTORY

Imager USING[Context];

Misc: CEDAR DEFINITIONS = BEGIN

MiscOneOf: TYPE = {empty, point, interval, rect};

--Intro: This interface was initially created to solve the problem of defining/constructing

-- channels for a set of components (ie. mapping into topological domain.)

--NB: All (unless stated otherwise) operations in this package return a copy of the object that is

-- TOTALLY independent (doesn't share) of their inputs (objects.) This is costly but

-- avoids a lot of possible obscure bugs from the confusion of objects sharing common subparts

--This is the window abstraction

Window: TYPE = REF WindowRep;

WindowRep: TYPE = RECORD[span: Interval, curtains: LIST OF Interval];

WindCreate: PROC[min, max: INT] RETURNS [Window];

WindAddCurtain: PROC[w: Window, curtain: Interval];

WindIsClosed: PROC[w: Window] RETURNS [BOOL];

WindPassesIntl: PROC[w: Window, intl: Interval] RETURNS [BOOL];

WindCurtainsCoverIntl: PROC[w: Window, intl: Interval] RETURNS [BOOL];

--This is the rectangle abstractions:

Rect: TYPE = REF RectRep;

RectRep: TYPE = RECORD[x, y: Interval];

RectSubtractFailure: ERROR [r1, r2: Rect];

RectCreate: PROC[xMin, yMin, xMax, yMax: INT] RETURNS[Rect];

RectCopy: PROC [r: Rect] RETURNS [Rect];

RectOneOf: PROC[r: Rect] RETURNS[MiscOneOf];

RectIntersect: PROC[r1, r2: Rect] RETURNS[Rect];

RectContainp: PROC[r1, r2: Rect] RETURNS[BOOL];

RectContainPt: PROC[r: Rect, xCoord, yCoord: INT] RETURNS [BOOL];

RectArea: PROC[r: Rect] RETURNS[NAT];

RectMakeBRect: PROC[r1, r2: Rect] RETURNS[Rect];

RectSubtract: PROC[r1, r2: Rect] RETURNS[Rect];

-- ! ERROR RectSubtractFailure if result is not a Rectangle --

RectPaint: PROC[r: Rect, context: Imager.Context, xOffset, yOffset: REAL, scaleFactor: REAL ← 1.0, stipple: CARDINAL, noFill: BOOL ← FALSE];

x: PROC[r: Rect] RETURNS [Misc.Interval];

-- = {RETURN [IF r = NIL THEN NIL ELSE r.x]}

y: PROC[r: Rect] RETURNS [Misc.Interval];

-- = {RETURN [IF r = NIL THEN NIL ELSE r.y]};

xMin: PROC[r: Rect] RETURNS[INT];

yMin: PROC[r: Rect] RETURNS[INT];

xMax: PROC[r: Rect] RETURNS[INT];

yMax: PROC[r: Rect] RETURNS[INT];

--This is the interval abstractions

Interval: TYPE = REF IntervalRep;

IntervalRep: TYPE = RECORD[min, max: INT];

IntlSubtractFailure: ERROR[i1, i2: Interval];

IntlCreate: PROC[min, max: INT] RETURNS[Interval];

IntlCopy: PROC[i: Interval] RETURNS[Interval];

IntlOneOf: PROC[i: Interval] RETURNS[MiscOneOf];

IntlMakeBIntl: PROC[i1, i2: Interval] RETURNS[Interval];

IntlContainp: PROC[i1, i2: Interval] RETURNS[BOOL];

IntlContainPt: PROC[i: Interval, p: INT] RETURNS[BOOL];

IntlIntersect: PROC[i1, i2: Interval] RETURNS[Interval];

IntlLength: PROC[i: Interval] RETURNS[NAT];

IntlSubtract: PROC[i1, i2: Interval] RETURNS[Interval];

--! ERROR IntlSubtractFailure if the result is not an Interval-

min: PROC [i: Interval] RETURNS [INT];

max: PROC[i: Interval] RETURNS [INT];

END.